Product Details
DD6 6-Speed Direct Drive Transmission Builders Kit by Baker Drivetrain®. Anti-overshift ratchet pawl and Longer primary chain included. From an engineering standpoint, it is difficult to design a machine or mechanism that achieves multiple objectives with minimal compromise. An amphibious car is a good example. A few have been manufactured over the years, and they achieved the goal of navigating on land and water, but did neither very well. On the other hand, a Swiss Army knife achieves multiple objectives with minimal compromise. You can snatch the cork out of a wine bottle or kill somebody all with the same widget. The DD6, or Direct Drive 6-speed, combines 3 technical approaches to achieve the most advanced transmission gearset design available for your Big Twin with minimal compromise. First, 1st through 3rd gears are straight cut (spur) for strength during maximum acceleration with no parasitic axial thrust. Secondly, 4th and 5th gears are automotive style helical gears for quiet and smooth operation as highway speed approaches. Lastly, 6th gear is direct drive which means there is no underdrive or overdrive in top gear which translates into 99% efficiency for minimum parasitic loss, minimum wear and tear, and maximum fuel efficiency.
Notes
- Speedo recalibration unit is required for electric speed sensor applications; PN 95E-56B
Features
- Billet 6061-T6 bearing door
- 1/8" thick bearing retainer plate
- Helical & spur gear design gear for quite operation
- 28 tooth comprocket forged out of 8620 gear steel
- Regina double row primary chain
- Fat shoe chain tensioner with hardware
- All transmission seals, gaskets and hardware
- Smoother shifting
- Positive, certain shifting
- Easier-to-find neutral
- Quieter operation
- More-efficient torque-handling
- 5 Year limited warranty
- Chrome trap door with engraved DD6 logo
- Made in USA
- Made to offer outstanding performance
- Perfect for both professionals and enthusiasts
- Guaranteed to provide superior operation for years
But Baker didn't focus solely on the gearset, Baker made this sucker shift like glass. The sequential motion of the hard chrome plated forks is controlled by a fixed spindle radial ball bearing mounted shift drum. Hard chrome guarantees long fork life with minimal imposed friction on the fork groove of the gear. The fixed spindle drum design eliminates any chance of binding or imposed friction about the axis of drum rotation. Drum rotation is controlled by a roller detent and actuated by a BAKER shift pawl with a anti-overshift feature. To make finding neutral an easy chore, Baker mounted a redundant detent on the left side pillow block.
All DD6 bearing doors have the same outer profile as a stock 5 speed so exhaust brackets, torque arms etc. fit like stock.
Bearing Door
All DD6 bearing doors have the same outer profile as a stock 5 speeds so exhaust brackets, torque arms etc. fit like stock. The DD6 door comes with or without an ear. The ear door is for exhaust bracket mounting and does not fit 1993-2006 FL applications. The DD6 door bearings are larger providing 25% more dynamic load capacity than stock bearings used through 1998, also uses a 1/8" bearing retainer plate instead of stock style snap rings.
Shift System
Bakers 6 Speed shift system with roller detent guarantees smooth shifts every time and Baker redundant neutral ensures that finding neutral is a easy chore. Baker mount a plunger detent on the left side pillow block and cut a plunger track into the shift drum itself. The plunger follows this track during operation (shifting) and when shifting into neutral pops into a pocket. This system lets you feel that you're shifting into neutral. No more guessing. Shift drum features more aggressive timing on the fork groove profiles and is case hardened to 58 Rockwell for wear resistance and crisp shifts. Baker built Baker reputation on smooth shifting 6-speed transmissions; Baker drum designs benefit from the engineering lessons learned.
Gearset
All DD6 gearsets are made out of 8620 steel, gears are shaper cut before heat treat then precision ground with diamond coated tooling after heat treat (58-62 Rockwell 'C'). This extra steps ensures not only a quieter gear pair, but enables much tighter backlash control. The gearset is a combination of helical and spur gears to yield silent gear operation. The dog teeth are backcut at a 1° angle to optimize the smooth shift possible, while standard gearsets are cut to a 4° angle. The mainshaft is unique with 1st main gear being incorporated as part of the shaft, the countershaft also features a unique 1-piece design with 6th gear.
The DD6 comes in a stardard 3.24 Ratio.
Standard Ratios- shown above are without the 28 tooth comp sprocket
Can be upgraded to the Reverse system DD6 builder's kit
Case Design
The BAKER Softail case design had all leak potentials in mind during the design. Baker added stud pads to the inside of the case so that the thread holes for the transmission studs were blind holes, NOT through holes like some aftermarket brands.
Recommended Fluid / Level
Picking the right transmission fluid ensures the life and durability of your transmission, that's why BAKER recommends a fully synthetic GL-5 rated gear weight oil of 75W-140. If a GL-5 rated gear lube is not available, these commonly carried viscosities (weights) will work 75W-90, 75W-140 and 85W-140. BAKER does not recommend the use of Syn3 (20W-50).
BAKER DD6 Fluid Capacity Dry: 22-24fl-oz.
BAKER DD6 Fluid Capacity Wet: 18-22fl-oz.
Baker Drivetrain® was founded in 1998 by Bert Baker, an avid bike tinkerer, who had a strong passion for improving the performance of American V-Twin Motorcycles. The company stays at the forefront of innovation offering an extensive line of cutting-edge American-made drivetrain components for a wide variety of Big Twin bikes. Everything from 5-speed, 6-speed, and 7-speed transmissions to clutches, kicker kits, pulleys, and sprockets, the company has what you need to make the most out of your bike. Strongly committed to quality and innovation, Baker Drivetrain uses the highest-grade materials and the latest technologies to create products that will help you enjoy the most thrilling rides of your life.